Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: Southwest’s DAL → SAN flights land within a few points of 3 in 4 on time whatever the hour.

Nonstops


Southwest	DAL	SAN	3h 10m	75%	1.3%	1,577	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach San Diego on time. Total trip = scheduled departure to arrival, layover included (San Diego is 2 h behind Dallas). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	DAL 06:00 → DEN 07:00WN 1296	1h 15m Denver	DEN 08:15 → SAN 09:40WN 1699	5h 40m	95%	82%
Delta Details →	DAL 10:09 → ATL 13:20DL 441	2h 16m Atlanta	ATL 15:36 → SAN 17:00DL 843	8h 52m	97%	77%
Southwest Details →	DAL 06:00 → PHX 06:28WN 1379	2h 47m Phoenix	PHX 09:15 → SAN 10:35WN 1677	6h 33m	100%	69%
Delta Details →	DAL 15:59 → ATL 19:14DL 512	2h 14m Atlanta	ATL 21:28 → SAN 23:00DL 896	9h 01m	93%	68%
Delta Details →	DAL 06:05 → ATL 09:15DL 516	53m Atlanta	ATL 10:08 → SAN 11:37DL 712	7h 32m	86%	67%
Southwest Details →	DAL 06:05 → LAS 06:50WN 1318	1h 50m Las Vegas	LAS 08:40 → SAN 09:55WN 2121	5h 50m	100%	63%
Southwest Details →	DAL 10:25 → PHX 10:55WN 1166	2h 40m Phoenix	PHX 13:35 → SAN 14:45WN 897	6h 20m	100%	62%
Southwest Details →	DAL 06:00 → MDW 08:15WN 1355	1h 53m Chicago	MDW 10:08 → SAN 12:15WN 4648	8h 16m	100%	58%
Tight connection: often missed
Southwest Details →	DAL 19:10 → DEN 20:30WN 1304	1h 00m Denver	DEN 21:30 → SAN 23:00WN 1704	5h 45m	58%	29%
Southwest Details →	DAL 12:35 → SJC 14:05WN 1407	53m San Jose	SJC 14:58 → SAN 16:22WN 3701	5h 48m	27%	13%
Southwest Details →	DAL 20:35 → PHX 21:05WN 3674	50m Phoenix	PHX 21:55 → SAN 23:05WN 3426	4h 32m	20%	11%

Same layover, different day-part

How often the first flight arrives too late to connect (45 min minimum), for one-ticket layovers of 45–80 minutes.

Morning

DEN · 1h 15m · leaves 06:00 5%

ATL · 53m · leaves 06:05 14%

IND · 50m · leaves 07:35 22%

Afternoon and evening

DEN · 1h 00m · leaves 19:10 42%

PHX · 50m · leaves 20:35 80%

Delays build through the day, so an afternoon first leg eats the layover. A short connection is fine early in the morning and a gamble later on.

Mixing airlines

One ticketMiss it and the airline rebooks you; bags go through. 45 min is enough.

Separate ticketsMiss it and you buy a new ticket. Re-check bags, clear security again: we require 90 min.


Southwest WN 1326 DAL 06:00 → LAX United UA 4643 LAX 09:00 → SAN Connection details →	1h 50m	6h 08m	95%	83%
Southwest WN 1408 DAL 07:00 → SLC Delta DL 1296 SLC 11:15 → SAN Connection details →	2h 35m	7h 17m	98%	81%
Southwest WN 3563 DAL 11:35 → DEN United UA 1281 DEN 15:55 → SAN Connection details →	3h 20m	7h 45m	97%	80%

Rank all connections, any airlines →

Regional partners count as the airline that sells them: SkyWest flying Delta Connection is one Delta ticket.

How these are worked out. Makes the connection: share of the last year’s flights where the first flight arrived with at least 45 minutes to spare (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled and arriving within 15 minutes. Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON